Rails 4: undefined method `primary_key_name'
rails-activerecord, ruby-on-rails, ruby-on-rails-4
Solution
I found the culprit, it's the `perfectline/validates_existence` gem which defaults to the deprecated `primary_key_name` instead of `foreign_key` when the `ActiveRecord::VERSION::MINOR >= 1` - go figure! I've submitted a pull request with the fix (https://github.com/perfectline/validates_existence/pull/20). Thanks for pointing me in the right direction @Beerlington.
Problem
I'm receiving the following error using Rails 4.0.0.beta: ``` NoMethodError: undefined method `primary_key_name' for #<ActiveRecord::Reflection::AssociationReflection ``` I don't get the exception when using Rails 3.2.x. I'm using Ruby 1.9.3-p194 for both Rails 3.2.13 and Rails 4.0.0.beta. The problem stems from the following `has_many` statement: ``` class Store < ActiveRecord::Base has_many :relationships has_many :customers, :through => :relationships, :source => :user, :conditions => { :relationships => { :description => "Customer" } } do def <<(user) proxy_association.owner.relationships.create(:description => "Customer", :user => user) end end end ``` I have following supporting classes: ``` class User < ActiveRecord::Base has_one :relationship has_one :store, :through => :relationship end class Relationship < ActiveRecord::Base belongs_to :store belongs_to :user end ``` I'd like to know how I can achieve the same `has_many` functionality using a Rails 4-friendly code? P.S. I'm aware I'm still using old-style syntax, and that the conditions hash now requires a proc or lambda, but these shouldn't causing the `undefined method` exception.